I inserted the Nitrokey 3A mini in a cheap mPCIe-USB adapter from Aliexpress.
The goal is to use an internal USB port in the Thinkpad T430 with Heads, and have the nitrokey inside as the secure storage of the secrets.
The adapter was too tight, pulling the key from the keychain ripped apart the dark plastic part and it came apart
There may be a need to improve on the stability of the parts. I will try to glue it together again.
A mini variant with USB-c could also be interesting, and make sense.